631
Area code
NY
United States geographic area code, in service since 1999-11-01. Part of the 631/934 overlay complex — ten-digit dialing required.
Statusin service
Introduced1999-11-01
JurisdictionNY, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 100.9% of assignable prefixes assigned
As of 09/17/2026
0%799 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-01-16, most recent 2025-09-03.
Area codes serve rate-center geographies, not municipal boundaries. “NY” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | VERIZON NEW YORK, INC. | 230 | 28.8% |
| 02 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 64 | 8% |
| 03 | OMNIPOINT COMMUNICATIONS, INC. - NY | 55 | 6.9% |
| 04 | CABLEVISION LIGHTPATH, INC. - NY | 55 | 6.9% |
| 05 | LEVEL 3 COMMUNICATIONS, LLC - NY | 53 | 6.6% |
| 06 | NEW CINGULAR WIRELESS PCS, LLC - DC | 49 | 6.1% |
| 07 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 44 | 5.5% |
| 08 | ONVOY, LLC- NY | 37 | 4.6% |
| 09 | TC SYSTEMS, INC. - NY | 34 | 4.3% |
| 10 | PAETEC ITEL, LLC | 32 | 4% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 2015-02-19 NPA 934 to Overlay NPA 631 (New York)
- 1999-11-01Area code 631 entered service (created from 516).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2015-02-19 | PL-476R1 ↗ | NPA 934 to Overlay NPA 631 (New York) |
| 2001-09-11 | PL-300 ↗ | Extended Permissive Dialing Ends for 516/631 NPAs (New York) |
| 1999-07-22 | PL-184 ↗ | Geographic Split of 516 (New York) Numbering Plan Area (NPA); addition of 631 NPA |